A method of reducing gaseous state loss of nitrogen in limestone soil by utilization of charcoal

Abstract

A method of reducing gaseous state loss of nitrogen in limestone soil by utilization of charcoal is disclosed. The method includes following steps of: 1) naturally withering corn straw, smashing until the size is 2-5 cm, adding the smashed corn straw into a carbonization device, and performing pyrolysis under anaerobic or anoxic conditions to obtain charcoal; 2) grinding the charcoal, and sieving; 3) modifying the charcoal, and adjusting the pH value of the charcoal; and 4) fully mixing the charcoal with agriculture limestone soil in subtropical zones according to a ratio of 20-50 t / ha, and fertilizing with the fertilizing depth being 20 cm from the surface layer of soil. The method is simple in operation, low in cost, prone to industrial production, convenient in popularization and easily accepted by farmers, is capable of effectively reducing the gaseous state loss of soil nitrogen, improving soil quality and playing a role of nitrogen fixation and fertilizer efficiency increasing, can be widely popularized and applied in the rural areas and has a good market prospect.

Description

technical field [0001] The invention relates to a method for reducing gaseous loss of nitrogen in lime soil by using biochar, and belongs to the technical field of biochar nitrogen fixation and fertilization. Background technique [0002] Since the 1970s, the amount of nitrogen fertilizer application in my country's agricultural production has increased rapidly, especially in some high-yield areas. However, from the perspective of historical changes, whether it is nitrogen fertilizer, phosphorus fertilizer, or potassium fertilizer, the fertilizer use efficiency of my country's main crops has gradually declined. my country's nitrogen fertilizer utilization rate is only 30% to 35%, which is 10 to 20 percentage points lower than that of developed countries. Among them, the gaseous loss of nitrogen is one of the main ways of nitrogen loss in farmland. Excessive application of nitrogen fertilizer aggravates the gaseous loss of nitrogen. Atmospheric nitrogen deposition caused by ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for reducing the gaseous loss of nitrogen in lime soil by using biochar, which has the advantages of simple operation, low manufacturing cost, easy industrial production, and can greatly reduce the gaseous loss of nitrogen in lime soil It can effectively solve the problems of serious nitrogen loss in the process of nitrogen fertilizer application in agricultural lime soil in subtropical areas, low nitrogen use efficiency, immature technology and methods, and difficult to popularize.

Images